METHODS AND DEVICES FOR SOURCE-CODING AND DECODING OF DATA INVOLVING SYMBOL COMPRESSION

摘要

There is provided a method of encoding input data (D1) at an encoder (50) to generate corresponding encoded data (E2). The method comprises the steps of: (a) separating and / or transforming the input data (D1) into one or more data chunks, analyzing the symbols present in the input data (D1) Compressing the symbols; (b) generating one or more code tables for symbols present in one or more data chunks, and / or one or more frequency tables, and / or one or more code word length tables; (c) associating the symbols and / or compressed symbols in each data chunk with entries in one or more code tables, and / or one or more frequency tables, and / or one or more code word length tables Computing one or more index sets; And (d) assembling one or more index sets, together with information indicative of one or more frequency tables and / or one or more code tables and / or one or more tables thereof, to generate encoded data E2. . An encoder 50 is also provided that uses the method in conjunction with a corresponding decoder 60. Encoder 50 and decoder 60 form a codec 100 in combination.